基于Lu模型的土石壩溫度場與飽和—非飽和滲流場耦合分析
發(fā)布時(shí)間：2018-11-06 08:44
【摘要】：滲流問題一直是土石壩工程研究的重點(diǎn)課題,在實(shí)際工程的滲流計(jì)算中,滲流場多被單獨(dú)考慮進(jìn)行研究,然而,滲流場受外界多方面環(huán)境影響,溫度作為土石壩滲流場的重要影響因素應(yīng)加以考慮,土石壩滲流場與溫度場是相互影響的雙向耦合關(guān)系,通過研究兩場耦合關(guān)系,可以建立更為合理的耦合模型,從而得出較為精確的數(shù)值解。由于滲流場與溫度場具有較強(qiáng)的耦合關(guān)系,可以通過研究溫度場來反饋滲流場特性,從而將研究成果應(yīng)用到滲流監(jiān)測中,為實(shí)際工程提供理論參考。本文主要采用理論分析和數(shù)值模擬的方法研究土石壩滲流場與溫度場耦合特征。首先,通過理論分析揭示了兩場相互作用的機(jī)理,在此基礎(chǔ)上,利用數(shù)值模擬方法分析了兩場耦合的基本特征,最后,通過實(shí)際工程進(jìn)一步研究了兩場耦合關(guān)系。本文主要內(nèi)容和成果如。下:(1)通過探究多孔介質(zhì)對(duì)流傳熱基本理論以及相關(guān)參數(shù)的影響因素,認(rèn)為土石壩飽和區(qū)域傳熱主要受對(duì)流傳熱影響,非飽和區(qū)域主要受熱傳導(dǎo)影響,也受對(duì)流傳熱影響:同時(shí),認(rèn)為流體的密度和粘度受溫度影響的變化會(huì)對(duì)土體的滲透性產(chǎn)生影響,尤其是流體粘度的變化會(huì)對(duì)滲流產(chǎn)生較大影響。(2)研究了 Lu導(dǎo)熱模型來描述傳熱參數(shù)隨含水率的變化關(guān)系。通過實(shí)測資料與理論分析研究了 Lu導(dǎo)熱模型的計(jì)算精度,認(rèn)為其能夠較為精準(zhǔn)的刻畫土體導(dǎo)熱系數(shù)隨含水率的變化關(guān)系。計(jì)算結(jié)果表明:通過估算巖土體石英含量采用Lu模型來描述導(dǎo)熱系數(shù)與飽和度的定量關(guān)系是可以滿足精度要求的;相比于常物性耦合模型,變物性滲流場與溫度場耦合模型計(jì)算更加精確;滲流場對(duì)溫度場影響較大,飽和區(qū)域溫度主要受對(duì)流傳熱影響,非飽和區(qū)域主要受熱傳導(dǎo)影響,滲流速度越大,對(duì)流傳熱影響越明顯。(3)以某土石壩工程為例,研究分析了大壩的三維滲流狀態(tài),同時(shí),建立了防滲墻滲漏下的土石壩兩場耦合模型,分析了滲漏情況下的土石壩溫度場與滲流場響應(yīng)特征,當(dāng)土石壩防滲墻發(fā)生滲漏時(shí),滲漏通道附近的巖土體受庫水溫影響,必將改變其周圍溫度場的分布,若通過測溫儀器監(jiān)測到該處溫度場的變化,便可以捕捉到滲漏點(diǎn)以及滲漏發(fā)生的時(shí)間。通過分析大壩溫度場變化是可以反饋出大壩滲流場的時(shí)空分布特征的。
[Abstract]:Seepage problem has always been a key research topic in earth-rock dam engineering. In the seepage calculation of practical projects, seepage field is mostly considered separately. However, seepage field is affected by many aspects of environment. Temperature as an important factor affecting seepage field of earth-rock dam should be considered. The seepage field and temperature field of earth-rock dam are bidirectional coupling relationship of mutual influence. By studying the coupling relation of two fields, a more reasonable coupling model can be established. Thus, a more accurate numerical solution is obtained. Because of the strong coupling relationship between seepage field and temperature field, the characteristics of seepage field can be feedback by studying temperature field, thus the research results can be applied to seepage monitoring and provide theoretical reference for practical engineering. In this paper, the coupling characteristics of seepage field and temperature field of earth-rock dam are studied by means of theoretical analysis and numerical simulation. Firstly, the mechanism of the interaction between the two fields is revealed by theoretical analysis. On this basis, the basic characteristics of the coupling of the two fields are analyzed by using the numerical simulation method. Finally, the coupling relationship between the two fields is further studied by practical engineering. The main contents and achievements of this paper are as follows. The following conclusions are as follows: (1) by exploring the basic theory of convection heat transfer in porous media and the influencing factors of related parameters, it is considered that the heat transfer in saturated region of earth-rock dam is mainly affected by convection heat transfer, and that in unsaturated region is mainly affected by heat conduction. Also affected by convective heat transfer: at the same time, it is considered that the change of density and viscosity of fluid affected by temperature will affect the permeability of soil. Especially the change of fluid viscosity will have a great impact on the seepage. (2) the Lu heat conduction model is studied to describe the relationship between heat transfer parameters and water content. Based on the measured data and theoretical analysis, the calculation accuracy of Lu thermal conductivity model is studied, and it is considered that it can accurately describe the relationship between soil thermal conductivity and moisture content. The results show that Lu model can be used to describe the quantitative relationship between thermal conductivity and saturation by estimating the quartz content of rock and soil. Compared with the constant physical coupling model, the coupling model of variable physical seepage field and temperature field is more accurate. The influence of seepage field on temperature field is great, the temperature in saturated region is mainly affected by convection heat transfer, and in unsaturated region is mainly affected by heat conduction. The larger the seepage velocity is, the more obvious is the influence of convection heat transfer. (3) taking a certain earth-rockfill dam project as an example, The three dimensional seepage state of the dam is studied and analyzed. At the same time, two coupling models of earth and rock dam under seepage of impervious wall are established, and the response characteristics of temperature field and seepage field of earth and rock dam under seepage condition are analyzed. When seepage occurs in the impervious wall of earth and rock dam, The distribution of the surrounding temperature field will be changed by the influence of the reservoir temperature on the rock and soil near the leakage channel. If the temperature field is monitored by the thermometer, the leakage point and the time of the leakage can be captured. By analyzing the variation of dam temperature field, the temporal and spatial distribution characteristics of dam seepage field can be feedback.
【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TV641
本文編號(hào)：2313787
[Abstract]:Seepage problem has always been a key research topic in earth-rock dam engineering. In the seepage calculation of practical projects, seepage field is mostly considered separately. However, seepage field is affected by many aspects of environment. Temperature as an important factor affecting seepage field of earth-rock dam should be considered. The seepage field and temperature field of earth-rock dam are bidirectional coupling relationship of mutual influence. By studying the coupling relation of two fields, a more reasonable coupling model can be established. Thus, a more accurate numerical solution is obtained. Because of the strong coupling relationship between seepage field and temperature field, the characteristics of seepage field can be feedback by studying temperature field, thus the research results can be applied to seepage monitoring and provide theoretical reference for practical engineering. In this paper, the coupling characteristics of seepage field and temperature field of earth-rock dam are studied by means of theoretical analysis and numerical simulation. Firstly, the mechanism of the interaction between the two fields is revealed by theoretical analysis. On this basis, the basic characteristics of the coupling of the two fields are analyzed by using the numerical simulation method. Finally, the coupling relationship between the two fields is further studied by practical engineering. The main contents and achievements of this paper are as follows. The following conclusions are as follows: (1) by exploring the basic theory of convection heat transfer in porous media and the influencing factors of related parameters, it is considered that the heat transfer in saturated region of earth-rock dam is mainly affected by convection heat transfer, and that in unsaturated region is mainly affected by heat conduction. Also affected by convective heat transfer: at the same time, it is considered that the change of density and viscosity of fluid affected by temperature will affect the permeability of soil. Especially the change of fluid viscosity will have a great impact on the seepage. (2) the Lu heat conduction model is studied to describe the relationship between heat transfer parameters and water content. Based on the measured data and theoretical analysis, the calculation accuracy of Lu thermal conductivity model is studied, and it is considered that it can accurately describe the relationship between soil thermal conductivity and moisture content. The results show that Lu model can be used to describe the quantitative relationship between thermal conductivity and saturation by estimating the quartz content of rock and soil. Compared with the constant physical coupling model, the coupling model of variable physical seepage field and temperature field is more accurate. The influence of seepage field on temperature field is great, the temperature in saturated region is mainly affected by convection heat transfer, and in unsaturated region is mainly affected by heat conduction. The larger the seepage velocity is, the more obvious is the influence of convection heat transfer. (3) taking a certain earth-rockfill dam project as an example, The three dimensional seepage state of the dam is studied and analyzed. At the same time, two coupling models of earth and rock dam under seepage of impervious wall are established, and the response characteristics of temperature field and seepage field of earth and rock dam under seepage condition are analyzed. When seepage occurs in the impervious wall of earth and rock dam, The distribution of the surrounding temperature field will be changed by the influence of the reservoir temperature on the rock and soil near the leakage channel. If the temperature field is monitored by the thermometer, the leakage point and the time of the leakage can be captured. By analyzing the variation of dam temperature field, the temporal and spatial distribution characteristics of dam seepage field can be feedback.
【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TV641
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